Method for improving abrasion resistance of crude terephthalic acid hydrofining palladium-carbon catalyst

A crude terephthalic acid, palladium carbon catalyst technology, applied in chemical instruments and methods, organic compound/hydride/coordination complex catalysts, physical/chemical process catalysts, etc., can solve the problem of poor wear resistance of catalysts
CN103769210AActive Publication Date: 2014-05-07CHINA PETROLEUM & CHEM CORP +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CHINA PETROLEUM & CHEM CORP
Publication Date
2014-05-07

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Abstract

The invention relates to a method for improving abrasion resistance of a crude terephthalic acid hydrofining palladium-carbon catalyst, and mainly solves the problem of easy abrasion of the catalyst in use in the prior art. The method for improving the abrasion resistance of the crude terephthalic acid hydrofining palladium-carbon catalyst comprises the following steps: (A) a fresh commercial palladium-carbon catalyst is dried under the protection of inert gas of 80-120 DEG C; (B) modified organosilicon, being 0.005-1.0% of the mass of the dried fresh catalyst and using polydimethylsiloxane as matrix, is sprayed on the dried fresh catalyst, and is dried under the protection of the inert gas; the modified organosilicon is at least one of ammonia-modified organosilicon, epoxy-modified organosilicon or polyether-modified organosilicon. The method preferably solves the problem, and can be applied to the industrial production of crude terephthalic acid hydrofining.
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Description

technical field

[0001] The invention relates to a method for improving the wear resistance of a crude terephthalic acid hydrotreating palladium carbon catalyst. Background technique

[0002] Crude terephthalic acid hydrogenation refining palladium carbon catalyst generally has a palladium mass percentage content of 0.50%, and the main impurity in crude terephthalic acid is p-aldehyde benzoic acid at a temperature of 270-290°C and a pressure of 7.0-8.5Mpa (commonly known as 4-CBA) is converted into p-toluic acid and removed by crystallization and centrifugation. As we all know, in industrial applications, the active component palladium in the palladium-carbon catalyst is distributed on the surface of the carrier. It is a common phenomenon that the palladium is lost due to the washing of the reactants and the activity of the catalyst is reduced. The waste catalyst unloaded from the industrial device generally contains less than How to slow down the loss of palladium is a diff...

Claims

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